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Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 3,470,337	$ 2,541,107
Available-for-sale, Gross Unrealized Gains	14,127	384
Available-for-sale, Gross Unrealized Losses	(216,448)	(295,419)
Available-for-sale, Fair Value	3,268,016	2,246,072
Held-to-maturity, Amortized Cost	1,150,520	1,152,906
Held-to-maturity, Gross Unrealized Gains	1,442	164
Held-to-maturity, Gross Unrealized Losses	(109,459)	(146,253)
Held-to-maturity securities, Fair value	1,042,503	1,006,817
Total debt securities, Amortized Cost	4,620,857	3,694,013
Total debt securities, Gross Unrealized Gains	15,569	548
Total debt securities, Gross Unrealized Losses	(325,907)	(441,672)
Total securities, Fair Value	4,310,519	3,252,889
U.S. Treasury [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	195,716	146,113
Available-for-sale, Gross Unrealized Gains	200	63
Available-for-sale, Gross Unrealized Losses		(63)
Available-for-sale, Fair Value	195,916	146,113
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	241,932	224,944
Available-for-sale, Gross Unrealized Gains	338
Available-for-sale, Gross Unrealized Losses	(21,980)	(30,702)
Available-for-sale, Fair Value	220,290	194,242
Held-to-maturity, Amortized Cost	2,559	2,988
Held-to-maturity, Gross Unrealized Losses	(157)	(260)
Held-to-maturity securities, Fair value	2,402	2,728
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	2,677,573	1,850,284
Available-for-sale, Gross Unrealized Gains	12,144	245
Available-for-sale, Gross Unrealized Losses	(188,892)	(257,088)
Available-for-sale, Fair Value	2,500,825	1,593,441
Held-to-maturity, Amortized Cost	28,369	32,803
Held-to-maturity, Gross Unrealized Gains	1
Held-to-maturity, Gross Unrealized Losses	(1,713)	(2,754)
Held-to-maturity securities, Fair value	26,657	30,049
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	145,807	235,873
Available-for-sale, Gross Unrealized Gains	212	51
Available-for-sale, Gross Unrealized Losses	(3,182)	(4,142)
Available-for-sale, Fair Value	142,837	231,782
Asset-Backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	70,799
Available-for-sale, Gross Unrealized Gains	104
Available-for-sale, Gross Unrealized Losses	(143)
Available-for-sale, Fair Value	70,760
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	79,147	1,098,957
Available-for-sale, Gross Unrealized Gains	289	164
Available-for-sale, Gross Unrealized Losses	(2,208)	(143,130)
Available-for-sale, Fair Value	77,228	955,991
Held-to-maturity, Amortized Cost	1,109,543	71,919
Held-to-maturity, Gross Unrealized Gains	1,378	25
Held-to-maturity, Gross Unrealized Losses	(107,587)	(3,324)
Held-to-maturity securities, Fair value	1,003,334	68,620
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	59,363	11,974
Available-for-sale, Gross Unrealized Gains	840
Available-for-sale, Gross Unrealized Losses	(43)	(100)
Available-for-sale, Fair Value	60,160	11,874
Held-to-maturity, Amortized Cost	10,049	18,158
Held-to-maturity, Gross Unrealized Gains	63
Held-to-maturity, Gross Unrealized Losses	(2)	(109)
Held-to-maturity securities, Fair value	$ 10,110	$ 18,049

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